Modeling nitrous acid and its impact on ozone and hydroxyl radical during the Texas Air Quality Study 2006

被引:77
作者
Czader, B. H. [1 ]
Rappenglueck, B. [1 ]
Percell, P. [1 ]
Byun, D. W. [1 ,2 ]
Ngan, F. [1 ]
Kim, S. [1 ]
机构
[1] Univ Houston, Dept Earth & Atmospher Sci, Houston, TX 77042 USA
[2] NOAA, Air Resources Lab, Silver Spring, MD 20910 USA
关键词
ATMOSPHERIC BOUNDARY-LAYER; OH RADICALS; ORGANIC-COMPOUNDS; EXCITED NO2; HUMIC-ACID; HONO; HOUSTON; CONVERSION; SURFACES; PHOTOLYSIS;
D O I
10.5194/acp-12-6939-2012
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Nitrous acid (HONO) mixing ratios for the Houston metropolitan area were simulated with the Community Multiscale Air Quality (CMAQ) Model for an episode during the Texas Air Quality Study (TexAQS) II in August/September 2006 and compared to in-situ MC/IC (mistchamber/ion chromatograph) and long path DOAS (Differential Optical Absorption Spectroscopy) measurements at three different altitude ranges. Several HONO sources were accounted for in simulations, such as gas phase formation, direct emissions, nitrogen dioxide (NO2) hydrolysis, photoinduced formation from excited NO2 and photo-induced conversion of NO2 into HONO on surfaces covered with organic materials. Compared to the gas-phase HONO formation there was about a tenfold increase in HONO mixing ratios when additional HONO sources were taken into account, which improved the correlation between modeled and measured values. Concentrations of HONO simulated with only gas phase chemistry did not change with altitude, while measured HONO concentrations decrease with height. A trend of decreasing HONO concentration with altitude was well captured with CMAQ predicted concentrations when heterogeneous chemistry and photolytic sources of HONO were taken into account. Heterogeneous HONO production mainly accelerated morning ozone formation, albeit slightly. Also HONO formation from excited NO2 only slightly affected HONO and ozone (O-3) concentrations. Photo-induced conversion of NO2 into HONO on surfaces covered with organic materials turned out to be a strong source of daytime HONO. Since HONO immediately photo-dissociates during daytime its ambient mixing ratios were only marginally altered (up to 0.5 ppbv), but significant increase in the hydroxyl radical (OH) and ozone concentration was obtained. In contrast to heterogeneous HONO formation that mainly accelerated morning ozone formation, inclusion of photo-induced surface chemistry influenced ozone throughout the day.
引用
收藏
页码:6939 / 6951
页数:13
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